> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/about-the-author/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/about-the-author/yun-wei-ri-chang-ji-lu/centos-7-xi-tong-kuo-rong-gen-fen-qu.md). # CentoS 7 系统扩容根分区 #### 博客作者：联系请[点击](https://hezhiqiang.gitbook.io/about-the-author/lian-xi-zuo-zhe)，搬运不易，希望请作者喝咖啡，可以点击[联系博客作者](https://hezhiqiang.gitbook.io/about-the-author/lian-xi-zuo-zhe) ## 需求场景： {% hint style="success" %} 需要将客户物理机磁盘剩余的空闲空间分区，合并到逻辑卷，扩展根分区 {% endhint %} ## **当前环境：** ```sh [root@master ~]# df -h 文件系统容量已用可用已用% 挂载点 /dev/mapper/centos-root 10T 9.5T 549G 95% / devtmpfs 16G 0 16G 0% /dev tmpfs 16G 0 16G 0% /dev/shm tmpfs 16G 9.7M 16G 1% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/vda2 2.0G 166M 1.9G 9% /boot tmpfs 3.2G 0 3.2G 0% /run/user/0 ``` 可以看到vda 磁盘有20T 还有10T空闲空间没有分配 ```sh [root@master ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 1024M 0 rom vda 252:0 0 19.8T 0 disk ├─vda1 252:1 0 1M 0 part ├─vda2 252:2 0 2G 0 part /boot └─vda3 252:3 0 10T 0 part └─centos-root 253:0 0 10T 0 lvm / ``` ## 操作步骤： ### 第一步：将剩余空间分区

[root@master ~]# parted /dev/vda

(parted) print                                                            
错误: 备份 GPT 表不像应该的那样出现在磁盘的末尾。这可能意味这其它操作系统相信磁盘小一些。通过将备份移动到末尾 (并删除旧备份) 来修正？

修正/Fix/忽略/Ignore/放弃/Cancel? Fix                                     
警告: Not all of the space available to /dev/vda appears to be used, you can fix the GPT to use all of the
space (an extra 1468006400 blocks) or continue with the current setting? 

修正/Fix/忽略/Ignore? Fix                                                 
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 21.7TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 
Number  Start   End     Size    File system  Name                  标志
 1      1049kB  211MB   210MB   fat16        EFI System Partition  启动
 2      211MB   1285MB  1074MB  xfs
 3      1285MB  537GB   536GB                                      lvm

(parted) mkpart                                                           
分区名称？  []? 4                                                         
文件系统类型？  [ext2]? xfs                                               
起始点？ 11.0TB                                                            
结束点？ 21.7TB
                                                           
(parted) print                                                            
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 21.7TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 
Number  Start   End     Size    File system  Name  标志
 1      1049kB  2097kB  1049kB                     bios_grub
 2      2097kB  2150MB  2147MB  xfs
 3      2150MB  11.0TB  11.0TB                     lvm
 4      11.0TB  21.7TB  10.7TB               4
(parted) quit                                                             
信息: You may need to update /etc/fstab.

{% hint style="info" %} 说明：parted 分区退出自动保存，不像fdisk需要保存 {% endhint %} ### 第二步：格式化分区 ```sh [root@master ~]# mkfs.xfs /dev/vda4 ``` 查看当前逻辑卷 ```sh [root@master ~]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 2 Act PV 2 VG Size 10 TiB PE Size 4.00 MiB Total PE 5180926 Alloc PE / Size 5180926 / 10 TiB Free PE / Size 0 / 0 VG UUID jw3yqY-Ssfb-NNu3-iwDN-4CV2-d4Nq-uFL0So ``` ### 第三步：逻辑化分区/dev/vda4，准备给centos逻辑卷扩容 ```sh [root@master ~]# pvcreate /dev/vda4 WARNING: xfs signature detected on /dev/vda4 at offset 0. Wipe it? [y/n]: y Wiping xfs signature on /dev/vda4. Physical volume "/dev/vda4" successfully created. ``` ### 第四步：开始扩容 ```sh [root@master ~]# vgextend centos /dev/vda4 Volume group "centos" successfully extended [root@master ~]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 2 Act PV 2 VG Size 19.76 TiB PE Size 4.00 MiB Total PE 5180926 Alloc PE / Size 5180926 / 19.76 TiB Free PE / Size 0 / 0 VG UUID jw3yqY-Ssfb-NNu3-iwDN-4CV2-d4Nq-uFL0So ``` {% hint style="info" %} 说明：磁盘空闲空间增长到19.76T,说明扩容成功 {% endhint %} ### 第五步：扩容/dev/mapper/centos-root逻辑卷分区 ```sh [root@master ~]# lvextend -l +100%FREE /dev/mapper/centos-root Size of logical volume centos/root changed from <10.00 TiB (2620927 extents) to 19.76 TiB (5180926 extents). Logical volume centos/root successfully resized. ``` ### 第六步：更新逻辑卷分区的大小 ```sh [root@master ~]# xfs_growfs /dev/mapper/centos-root meta-data=/dev/mapper/centos-root isize=512 agcount=10, agsize=268435455 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=2683829248, imaxpct=5 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=521728, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 2683829248 to 5305268224 ``` ### 第七步：检查是否扩容更新成功 ```sh [root@master ~]# df -h 文件系统容量已用可用已用% 挂载点 /dev/mapper/centos-root 20T 9.5T 11T 48% / devtmpfs 16G 0 16G 0% /dev tmpfs 16G 0 16G 0% /dev/shm tmpfs 16G 9.7M 16G 1% /run tmpfs 16G 0 16G 0% /sys/fs/cgroup /dev/vda2 2.0G 166M 1.9G 9% /boot tmpfs 3.2G 0 3.2G 0% /run/user/0 ``` [^1]: